# -*- coding: utf-8 -*-#
#-------------------------------------------------------------------------------
# 建立者:        潘炎珍  
# Name:         test08
# Description:
# Author:       98745
# Date:         2019/4/10
#-------------------------------------------------------------------------------

import heapq
import collections

a=set([2,3,4])
b=set([5,6,7])
print(a.union(b))